Santos. Big JMW, southpaw, good counterpuncher, awkward, has a decent punch and a decent beard. There's no reason why Santos couldn't execute Quintana's gameplan even better than Quintana did.
Even when Quintana was stopped in the rematch he landed some very nice lefts. The first fight Williams was totally outclassed. Santos is waaay bigger than Carlos Q. Think about that.
Thats why I reckon in all fairness there should be a rubber match with Quintana...PW blew Quintana out, it happens...If they fought 20 more times Williams wouldnt do that to him again more then likely. But Carlos just didnt beat PW..he outboxed and outclassed him over the just about the whole 36 mins...That fight wasnt really close.